Younger or older kids? We have stayed at both and we love them both. They have a similar feel. AKL is farther away from things, but the animals make up for it.
When DD was small we preferred WL because it was close to and had boat service to MK. One of the boats, which we almost always got, you did not have to fold the stroller. AKL, you have to take buses everywhere so if you have a stroller it can be a pain. Plus, if you plan on spending the biggest chunk of time at MK, it does take longer to get there. At AKL we had a Savannah view room and we absolutely loved being able to go out on the balcony and watch giraffes. Now that we have gotten rid of the stroller, we will probably plan another stay at AKL at some point.